Imager is a perl module for manipulating gray, color and rgba format images.
It can read various file formats and has a builtin interpretered language for
blends, fade and multiimage effects. It also has a plugin interface to write
plugins in C. It also has drawing primitives and supports antialiased truetype
and postscript fonts.

WWW: http://www.eecs.umich.edu/~addi/perl/Imager/